Select版本兼容，下拉框出现后立马消失

[YuhuiM]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

2.0.0-rc.7

Environment

Chrome66

Reproduction link

Steps to reproduce

点击下拉框

What is expected?

正常显示

What is actually happening?

下拉框出现后立马消失

---

下拉框动画类名未移除，导致opacity: 0一直生效

[John60676]

我这边看正常，你是如何触发的

[YuhuiM]

@John60676 我在Chrome66版本发现的，你的浏览器是哪个版本

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 7 days

[github-actions]

This issue has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.